![](/drem/stage23/labels/S9L.gif)
![cerebral aqueduct (mesocoele), intermediate zone, loose connective tissue, marginal zone, osteogenic layer, pericranium, roof plate of mesencephalon, subarachnoid space, surface ectoderm, ventricular zone](/drem/stage23/Z0/S9N.jpg)
![](/drem/rulerbg.png)
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Carnegie Embryo #9226 | Location: 9-01-01
Keywords: cerebral aqueduct (mesocoele), intermediate zone, loose connective tissue, marginal zone, osteogenic layer, pericranium, roof plate of mesencephalon, subarachnoid space, surface ectoderm, ventricular zone
Source: The Virtual Human Embryo.